1:1
a servant of Christ Jesus: The word servant describes key Old Testament leaders of God's people, such as:
Moses (2 Kings 18:12),
Joshua (Joshua 24:29),
Elijah (2 Kings 10:10), and
David (2 Samuel 7:8).
This title emphasizes the apostle Paul's total submission to Christ as Lord.
set apart: Paul may be saying that God set him apart for his mission before he was born. This idea is similar to the call of the prophet Jeremiah (Jeremiah 1:5). Paul may also be thinking about God’s call during his conversion on the road to Damascus, when God chose him for a special task (Acts 9:15–16; compare Acts 13:2). God called Paul to preach the good news about Jesus to Jews and especially to Gentiles (non-Jews).
The good news, also called "the gospel," appears many times at the beginning of this letter (Romans 1:1, 9, 15, 16). Paul takes the word gospel from the Old Testament. There, the Hebrew word refers to news of victory. It describes the victory God wins for his people and the hope he brings to them (Isaiah 40:9; 41:27; 60:6; 61:1; Nahum 1:15; see Joel 2:32).